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lands, and (3) return now from use of stored water and from additiomal . natural-flow diversions t'O the new lands. The. first two cause depletions to Rio Grande flows. The third inGreases the flows of the Rio Grande above otowi at certain times. The suggested aCClOunting method for the daily or short-term effect tributary units would have on the Rio Grande flows and.re:place- IlJlIlnt releases required from Reren No. It. Reservoir are described below. Storage Whenever water is stered in project rese:t"V'oirs of a tributary unit, an equivalent release wouJ.d be made trom Heron No. 4 Reservoir. This can be made on the same day, &1' if neeesary, lagged by hours or days to allow for ease in eOllDlllmieations. Direct :Flow Diversions ~~ The procedures :tor all of the tributary w:t:l.ts have the cOllllllOn hypothesis that the units are entitled to direct flow diversions withOut replacemant releases from Heron No.4 Reservoir to the extent thS.t theSE! diversions would have been made under pre-project conditions. All additional direct diversions of natural flow are<:conside:red replaceable by equivalent releases from He:t'on No. 4 Reservoir. :Bypasses may be required at diversion ;points, as well as below rese:t"V'oirs, to meet downstream p"'ior rights a:n.dfor to maintain streams for fish and wildlife purposes. Gages would be installed as needed to properly accO'lmt tor such bypasses. Return Flow Credit Since part of the increased divers:l.ons, both from storage and natural flow, w:Ulleave the project area and return to the river as return flow, an a.ppre>priate credit will be given :for this 1nl:reased return flow on a daily or other short period basis iu lllaking delivery of' San JuanpChama water at Otowi. Return flow will be com;pu:t;edtor tr:l.butary unit areasa.sa aUf'erencebErtireen. dlverdons ot natUral f'1owS plus. storage releases aiid."net'consumpt1Ve use; The1Zei:m lfniitui'alflOw". as is usedherelit""' exclti.d.e"s - rtidiverted. i-eturi:t" flows; 0 "Net cansiii:n:Pt:lve 'use'" is"cQiisUil!Pt:l.ve" . use' (iollij;ll1ted'ooy standard :t'grmulas, such as Blaney"C:t'iddle, less ef:f'eetive precipitation. It wi.ll be necessary to cQllij;lUte the return flows that would have left the project area. under pre-pr0ject eondi t:l.ons as well as the return flow lea.ving the area Ul'lder p:t'oject conditions to determine the appropriate credit tcnl"' increased l'eturn flow. The consUllqrtiveuse to be applied in determining return flows thet would have occurred ude:t' 19